diff --git a/Chapter_06/Chapter_06.sql b/Chapter_06/Chapter_06.sql
index c52b2e9..c154177 100644
--- a/Chapter_06/Chapter_06.sql
+++ b/Chapter_06/Chapter_06.sql
@@ -133,11 +133,11 @@ SELECT sum(pop_est_2019) AS county_sum,
        percentile_cont(.5)
        WITHIN GROUP (ORDER BY pop_est_2019) AS county_median
 FROM us_counties_pop_est_2019;
-select * from us_counties_pop_est_2019 order by pop_est_2019 asc;
+
 -- Listing 6-12: Passing an array of values to percentile_cont()
 
 -- quartiles
-SELECT percentile_cont(array[.25,.5,.75])
+SELECT percentile_cont(ARRAY[.25,.5,.75])
        WITHIN GROUP (ORDER BY pop_est_2019) AS quartiles
 FROM us_counties_pop_est_2019;